How do I request a quotation for undercarriage parts, and how fast will I get a reply?

Send the part numbers or casting numbers where present — or the machine model and serial number plus the shoe width and link pitch for track groups — together with the quantity of each line and the destination port through the contact page of Guangzhou Shenyue Machinery Technology Co., Ltd. Quotations normally come back within 24 hours, with complete groups and individual components quoted as separate lines.

Should I replace the whole track group or individual components?

It depends on wear spread. A chain worn near its limit will chew fresh sprockets fast, so chain and sprockets are best replaced as a matched set; rollers and idlers with even wear can be replaced on their own schedule. Measure each component and quote both routes — the complete group and the piece-by-piece plan — then choose with numbers.

Do undercarriage parts for non-Kobelco machines need special identification?

No — the discipline is identical. Shoe width, link pitch and bushing diameter plus the machine model and serial identify track groups; roller and idler casting numbers or measurements identify the rest. We confirm from what you send, not from the badge on the machine.

Excavator Undercarriage Wear Guide: Track Links, Rollers, Idlers and Sprockets

Category Guide · September 27, 2026 · Guangzhou, China

Excavator Undercarriage: How to Judge Wear on Track Groups, Rollers, Idlers and Sprockets

Undercarriage is the quiet budget-killer of excavator ownership: it can absorb a substantial share of total owning and operating cost, it wears every hour the machine moves, and it punishes neglect twice — once in replacement cost, and again in the damage a worn chain inflicts on the sprockets and rollers around it. The good news is that undercarriage wear is measurable and predictable, which makes it one of the easiest categories to buy well. Corbay is the international export brand of Guangzhou Shenyue Machinery Technology Co., Ltd., Guangzhou, China. Track groups, rollers, idlers and sprockets are quoted from Guangzhou daily across Kobelco, Komatsu, Hitachi, Doosan, Hyundai and other makes, and this guide is how we help buyers read their own undercarriage before ordering.

What Each Component Does — and How It Fails

Track links and shoes.The chain carries the machine's weight and every shock it takes. Links wear on the rail surfaces and at the pins and bushings; shoes wear on the grousers and crack under twisting loads. Elongation beyond limit is the replacement trigger — and a stretched chain is destroying the sprocket beneath it every hour.

Track rollers (bottom).Rolled steel against rolling load, in mud and grit. Wear shows on the tread and flanges; oil loss through a failed seal shows as a hot, dry roller. Bottom rollers carry the machine and wear fastest.

Carrier rollers (top) and front idlers.Lighter duty but not wear-free — a seized carrier roller flats-spots and vibrates the whole upper run; idler wear shows on the tread and flanges and in track tension that will not hold.

Sprockets.The sprocket's teeth drive the bushings, so the two wear together. A pointed, hooked tooth profile is the visual sign — and a new chain on a worn sprocket, or a new sprocket under a worn chain, eats both.

The Measurements That Decide the Order

Undercarriage is one of the few categories where the buyer can verify nearly everything with a tape and a gauge. Shoe width and link pitch identify the track group — the same machine model can carry different shoe widths for different applications, so measure rather than assume. Rail height and bushing diameter show how far the chain has worn toward its limit. Roller and idler tread and flange diameters, measured at the worn point, separate a serviceable part from a replacement. If your own measurements are not available, clear photos of the worn surfaces plus the machine model and serial number are usually enough for us to quote correctly — and where a casting number is present, that number always outranks the model name. The machine makers' official parts documentation shows how undercarriage references are structured against machine series, and our wear-life guide covers what working hours to expect from each component in typical duty.

Replace as a System — and Stock Before the Season

Match chains and sprockets.These two wear into each other; replacing one without the other halves the life of both. When the chain is near limit, quote chain and sprockets together.

Rollers and idlers on their own schedule.Evenly worn rollers and idlers can be replaced selectively — quote them individually so you replace what needs replacing, not the whole frame.

Keep tension right.Over-tight tracks accelerate bushing and roller wear; over-loose tracks shed and vibration-crack. Tension checks cost nothing and extend every component's life.

Consolidate the shipment.Undercarriage is heavy, so it rewards planning — a planned round of chains, rollers and idlers fills a container at far better landed cost than crisis shipments. Browse the groups in the parts catalog.

What We Need to Quote Your Undercarriage

Five details: the part numbers or casting numbers where present — or machine model and serial plus shoe width and pitch for track groups; the quantity of each line; the application (rock, mud, demolition) so the right duty grade is quoted; your destination port; and your deadline if there is one. Send those to the team at Guangzhou Shenyue Machinery Technology Co., Ltd. through the contact page and the quotation normally comes back within 24 hours — complete groups and individual components as separate lines, in genuine, OEM-quality and aftermarket grades stated in writing. Buyers running mixed fleets get one consolidated quotation across brands, with every line graded and the maker named.

Undercarriage — FAQ

Can you quote a complete track group ready to fit?Yes — chains, shoes, rollers, idlers and sprockets are quoted as a matched group or as individual lines, packed by part number so your fitter receives each component labelled against the plan.

Which grades are available for undercarriage?All three: genuine via original supply channels where the channel exists, OEM-quality from the component supply base that serves the machine makers, and named-maker aftermarket for lower-duty work. The grade of every line is stated in writing on the quotation.

How do I request a quotation and how fast will I get a reply?Send the measurements or numbers, machine model and serial, quantities and destination port via the contact page — Guangzhou Shenyue Machinery Technology Co., Ltd. normally replies within 24 hours with grades and freight options together.

Measure Before the Chain Measures You

Undercarriage rewards the buyers who measure early: a chain replaced at its limit is a planned cost, while a chain replaced after it shredded the sprockets is three costs in one. Send the measurements, the casting numbers and the port, and the team at Guangzhou Shenyue Machinery Technology Co., Ltd. will quote the matched set — and the piece-by-piece alternative — so you choose with numbers.

Browse Undercarriage in the Catalog Send Measurements for a Quote

Corbay Excavator Parts is the international export brand of Shenyue Machinery (Guangzhou Shenyue Machinery Technology Co., Ltd.), Guangzhou, China. Shenyue is an independent parts specialist and is not affiliated with, or an authorized dealer of, Kobelco Limited. Parts are supplied as genuine, OEM or clearly identified aftermarket items, and the grade is stated on every quotation.